Microwave communication Micro waves – Electromagnetic waves in the range of 1 Ghz to 30 Ghz Micro waves travels only on a line of sight Transmitter and receiver must be in a straight line
Microwave communication Several repeaters are required b/w transmitter ans receiver at an interval of 50 Km Carrier frequency range – 3 to 12 Ghz Block shows the equipments needed for one channel micro wave system
Microwave communication At the sending end several telephone channels and one or more TV channels are frequency multiplexed to form the base band signal The base band signal is frequency modulated in FM modulator
Microwave communication Output of FM modulator is IF signal is converted in to microwave (4 GHz) in microwave transmitter The signal is amplified and fed to the direction antenna to sent to a repeater station constructed at 50 KM distance
Microwave communication At repeater station the received signal is down converted to IF (70 MHz) Amplified and then up converted to 6 GHz The frequency conversion is done to avoid the interference of incoming and outgoing signal
Microwave communication The signal is retransmitted to receiving signal The received signal is down converted to IF signal The IF signal fed to FM demodulator
Microwave communication Fm demodulator recovers the base band signal The base band signal is demultiplexed to get the telephone and television signal
Microwave communication Advantages Offers wide bandwidth Line of sight propagation Power requirement is low
Microwave communication Advantages Offers wide bandwidth Line of sight propagation Power requirement is low